In series circuit, Req = R₁ + R₂ + R₃ + ···
In parallel circuit, 
<h3>Q7.</h3>
total resistance in the upper branch = R₂ + R₃ = R₂ + 2
R₂ + 2 = 12
R₂ = 10Ω
<h3>Q8.</h3>
Req = 1.7Ω
Answer: 161.3
I have a acellus too and got this question correct, so I hope this helps y’all out
Answer: it needs to function using energy from sunlight, carbon dioxide from the air and water from the soil.
Explanation:
The denser the medium, the harder the sound struggles to travel through. The medium will determine how effectively the sound will travel, for example, large bodies of water has barely any sound for its density.
Preserved fossil<span> (like a fossil in amber, ice or tar.</span>
